/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.lvyh.lightframe.job.admin.route.strategy;


import com.lvyh.lightframe.job.admin.route.ExecuteNodeRouter;
import com.lvyh.lightframe.job.common.Result;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;

/**
 * LRU
 */
public class ExecuteNodeRouteLRU extends ExecuteNodeRouter {


    private static ConcurrentHashMap<Integer, LinkedHashMap<String, String>> jobLRUMap = new ConcurrentHashMap<Integer, LinkedHashMap<String, String>>();

    private static long CACHE_VALID_TIME = 0;


    public String getAddress(int jobId, List<String> addressList) {

        if (System.currentTimeMillis() > CACHE_VALID_TIME) {
            jobLRUMap.clear();
            CACHE_VALID_TIME = System.currentTimeMillis() + 1000 * 60 * 60 * 24;
        }

        LinkedHashMap<String, String> lruItem = jobLRUMap.get(jobId);

        if (lruItem == null) {
            lruItem = new LinkedHashMap<>(16, 0.75f, true);
            jobLRUMap.put(jobId, lruItem);
        }

        for (String address : addressList) {
            if (!lruItem.containsKey(address)) {
                lruItem.put(address, address);
            }
        }

        String eldestKey = lruItem.entrySet().iterator().next().getKey();
        String eldestValue = lruItem.get(eldestKey);
        return eldestValue;
    }

    @Override
    public Result<String> route(int jobId, List<String> addressList) {
        Result<String> result = Result.create();
        String address = getAddress(jobId, addressList);
        result.setResult(address);
        return result;
    }

}
